No error for top-level async with hotdeploy=true

[Legioth]

Description of the bug

In an application that uses a top-level await, errors are shown only when a bundle is being built (production build or app bundle when using hotdeploy=false) but not when running through Vite's dev mode (hotdeploy=true). This may lead to surprises in a late stage of development.

Expected behavior

Expected that Vite complains about top-level async also in dev mode with hotdeploy=true.

Minimal reproducible example

1. Get a Hilla app from start.vaadin.com
2. Launch once to generate frontend files
3. Copy frontend/generated/index.tsx into frontend´ and add a top-level await`
4. Notice that there are no errors
5. Create a production build
6. Notice errors

Versions

• Vaadin / Flow version: 24.5.0.beta1